CN101927413A - Manufacturing device and manufacturing method of butt seam-welded steel pipe - Google Patents
Manufacturing device and manufacturing method of butt seam-welded steel pipe Download PDFInfo
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- CN101927413A CN101927413A CN2009100537330A CN200910053733A CN101927413A CN 101927413 A CN101927413 A CN 101927413A CN 2009100537330 A CN2009100537330 A CN 2009100537330A CN 200910053733 A CN200910053733 A CN 200910053733A CN 101927413 A CN101927413 A CN 101927413A
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Abstract
The invention relates to a manufacturing device and a manufacturing method of a butt seam-welded steel pipe, a concave curved surface which surrounds the periphery and has a circular arc-shaped longitudinal section with the radius of R is formed on the side surface of each squeeze roller, a lower convex shoulder part is arranged below each concave curved surface, and an upper convex shoulder is arranged above each concave curved surface. The manufacturing method comprises the step of arranging an imaginary line L which is parallel to a rotating shaft of each squeeze roller at the central point 01 of the radius R of the corresponding concave curved surface. The distance from the imaginary line L to each lower convex shoulder part is taken as a, the distance from the imaginary line L to each upper convex shoulder part is taken as b, and the a is set to be less than the b. When the butt seam-welded steel pipe P is welded, a gap between the upper convex shoulder parts of a pair of the squeeze rollers is formed, thereby leading a plate-like body to walk between the concave curved surfaces and be curled, leading weld parts of two edges to protrude from the gap and gradually welding the two edges from the lower ends to the upper ends.The manufacturing device and the manufacturing method aim at improving the welding strength of the butt seam-welded steel pipe and avoiding collapses in welds.
Description
Technical field
The present invention relates to a kind of manufacturing installation and manufacture method that plate body is rolled into tubulose and two edges is added the butt seam welding steel tube of thermal weld with compression roller.
Background technology
Past, as heat supply water pipe and feed pipe, or be used for the butt seam welding steel tube of heat exchangers such as air conditioner and refrigerator, be to make metal plate-like bodies such as copper or brass be rolled into tubulose while advancing, use the welder that constitutes by high-frequency induction electric welding machine or high frequency resistance welding machine etc. continuously the both sides rim to be transported out the limit then and weld and make pipe.
In when welding, for example be rolled into the two edges heating of the plate body of C font with handle such as high-frequency induction electric welding machine of actuating coil that comprises load coil etc. and FERRITE CORE etc., produce concentrated Joule heat in two edges.Plate body is under the state that is rolled into the C font then, in the time of between by a pair of compression roller the two edges that have been heated pushed, and makes its butt joint and is welded into tubulose.
For example, in 56-26684 number bulletin, the concave curved surface that forms around full week in the side of each compression roller, its top and bottom are identical distance and see slightly semicircular in shape from the vertical section with respect to the rotating shaft of compression roller.Therefore, if relatively and leave plurality of gaps configuration, then so that plate body, is whole while two concave curved surfaces by weld is that the form of omiting circle disposes relatively a pair of compression roller.Then, the plate body that makes the C font is by between the concave curved surface of this a pair of compression roller, plate body contact with concave curved surface and with its further bending, adds thermal weld formation butt seam welding steel tube with these two edges.
When the plate body that is the C font being added thermal weld and makes butt seam welding steel tube with a pair of compression roller, in order to control the twisted of butt seam welding steel tube and to reduce the burden that shaping is processed, must to form the high butt seam welding steel tube of out of roundness, therefore, need the concave curved surface of compression roller be processed to form for the vertical section near the radius of butt seam welding steel tube external diameter be R slightly be semicircle shape.And a pair of compression roller when opposed, two relative concave curved surfaces constitute slightly rounded section shapes.
But, the two edges of plate body add thermal weld the time, be with actuating coil the two edges of plate body to be heated to the lower end from the upper end of its thickness of slab direction to dissolve, like this with the shape of above-mentioned compression roller, as shown in Figure 7, be that two edges T1, T2 mutual extrusion plate body T makes it carry out the face contact at thickness direction.At this moment, to the heating of the lower end of two edges,, can not add thermal weld and the low shortcoming of weld strength is arranged this part fully so have because the upper end of having been welded hides.
And because the top and bottom of concave curved surface and the rotating shaft of compression roller are same distance, therefore, the plate body that is extruded from both sides dissolves because of two edges T1, T2 face contact and be heated and causes that welding seam part M falls into to the inboard couch of butt seam welding steel tube P.Therefore the butt seam welding steel tube P that has produced so-called welding is twisted, needs that shaping is pretty troublesome after this, or butt seam welding steel tube P can not be processed by abundant shaping and is problems such as substandard products.
The present invention is in view of this truth, and its purpose is to provide a kind of butt seam welding steel tube manufacturing installation and manufacture method that can suppress the twisted and distortion of butt seam welding steel tube when welding.
Summary of the invention
The manufacturing installation of butt seam welding steel tube of the present invention, be a kind ofly ongoing plate body to be rolled into tubulose and to make it by between the concave curved surface that is formed at a pair of compression roller side, the butt seam welding steel tube manufacturing installation that its two edges is added thermal weld, it is characterized in that the distance of upper end is set at shorter than the distance to the concave curved surface lower end from the compression roller rotating shaft to concave curved surface.
The plate body of C font walks between the concave curved surface of a pair of compression roller of relative configuration, and contacts with concave curved surface, with crooked that diameter is littler the plate body along concave curve surface shape.Can highlight laterally from gap between the upper end (upper side flange portion portion) of two concave curved surfaces near the two edges of plate body then, and diminish because of its rigidity makes near the bending the two edges, plate body is abutted against mutually under more outstanding upward the situation in two edges and is heated welding.Therefore the two edges of plate body are soldered successively to the upper end from the lower end of thickness direction, do not have weld seam to subside and weld strength is high, two edges are welded reliably high-quality butt seam welding steel tube so formed.At this moment, the following splaying of the concave curved surface of a pair of compression roller is set forr a short time than upper gap, can prevent to be out of shape because of butt seam welding steel tube is absorbed in this gap partly like this when welding, and the gap of upper end can make welding slag disperse towards periphery.
In addition, the butt seam welding steel tube that the two edges that protrude in the plate body in formed gap, concave curved surface upper end are welded, the longitudinal axis that can form the vertical section is longer than transverse axis.
Soldered butt seam welding steel tube between the concave curved surface of a pair of compression roller, the weld seam of its two edges is outwards outstanding from the gap, formation slightly is ovum shape or teardrop shaped, with this, can in turn weld to the upper end from the lower end of the thickness direction of the two edges that begin to heat by the top while heating, owing to can dissolve along its thickness direction two edges to all heating, its weld strength height has also prevented to subside.
In addition, in the upper end side of the concave curved surface of compression roller, also can be by the upper side flange portion portion of specific thickness, the conical surface that tilts in the formation of compression roller rotating shaft one side.
To form the mode of upper side flange portion portion in the upper end side of the concave curved surface of compression roller, can be difficult for producing damaged, improve the intensity and the durability of compression roller, in addition, to form the method for the conical surface above it, when the two edges of the butt seam welding steel tube that exposes from the upper gap of concave curved surface weld seam dispersed welding slag, welding slag scattered from the surface of butt seam welding steel tube in the mode of dispersing along the conical surface, can prevent that welding slag is attached to the surface of butt seam welding steel tube.
The manufacture method of butt seam welding steel tube of the present invention, be that plate body during a kind of handle is advanced is rolled into tubulose and it is passed through between the concave curved surface that forms on the side of a pair of compression roller, two edges are added the butt seam welding steel tube manufacture method of thermal weld, the two edges of the plate body by compression roller are welded to upper end side from the lower end side of tabular body thickness direction.
So that be between the concave curved surface that the plate body of C font navigates on a pair of compression roller and the method that contacts with concave curved surface, crooked forr a short time profiling in the diameter of concave curve surface shape, in order to protrude out from the upper gap of two concave curved surfaces near the two edges that make plate body, the two edges that make plate body are protruded some and are abutted against mutually and add thermal weld to the top, the outside of the circle that is formed by concave curved surface.Therefore, be in the two edges of its thickness direction lower end side welding plate body at first, weld to upper end side then, so formed the butt seam welding steel tube that two edges are welded reliably gradually.
In addition, butt seam welding steel tube is near the parts two edges of plate body, sees laterally that from the vertical section (gap between concave curved surface) protrude and the two edges welding, the vertical section also can form the longitudinal axis shape longer than transverse axis.
Protrude from the upper gap of two concave curved surfaces laterally because of its rigidity the two edges of plate body, and near the two edges crooked little, welding during two edges from its thickness direction lower end side contact, weld.Therefore, even dissolve, can not cause subsiding and weld strength deficiency etc. and can form high-quality butt seam welding steel tube of weld part from the heating of the upper end of two edges yet.
Description of drawings
Fig. 1 is the production line summary pie graph of the butt seam welding steel tube manufacturing installation of the embodiment of the invention;
Fig. 2 is the vertical view with the major part of the welded condition of compression roller welding butt seam welding steel tube;
Fig. 3 is the profilograph of the major part of compression roller;
Fig. 4 is that view is adjusted in the installation of a pair of compression roller;
Fig. 5 is the welded condition figure with a pair of compression roller welding butt seam welding steel tube;
Fig. 6 A is the welded condition figure of the butt seam welding steel tube two edges of embodiment;
Fig. 6 B is the unfavorable welded condition figure in butt seam welding steel tube two edges;
Fig. 7 is the welded condition figure of butt seam welding steel tube two edges in the past.
The specific embodiment
Below, the manufacturing installation of the butt seam welding steel tube of the embodiment of the invention is described referring to figs. 1 through Fig. 6.
Fig. 1 is the production line summary pie graph of butt seam welding steel tube manufacturing installation, Fig. 2 is a pair of compression roller in the weld part of manufacturing installation shown in Figure 1 and the approximate vertical view of butt seam welding steel tube, Fig. 3 is the central longitudinal profile of compression roller, Fig. 4 is the local central longitudinal profile of adjustment state that a pair of compression roller is configured to the welding of plate body, the local central longitudinal profile of a pair of compression roller when Fig. 5 is the butt seam welding steel tube welding.
According to embodiments of the invention, butt seam welding steel tube is about being used for the smooth simple metal tube of inner face of hot-water line, feed pipe etc., but also be used for refrigerator and air-conditioning equipment etc. the inner face trough of belt pipe and form any metal tube of the metal tube etc. of sag and swell outside.In addition, the material of the butt seam welding steel tube that present embodiment is used is a brass tube, but also is applicable to copper pipe and aluminum pipe and other metal tube.
In butt seam welding steel tube (hereinafter referred to as pipe) manufacturing installation 1 as shown in Figure 1, strip of metal with certain width, for example the continuous band-shaped plate body T of brass pulls out continuously from uncoiler 2, the plate body T that is drawn out is through a pair of pressure roller 3, by many to the forming rolls 4 that forms a line gradually floor-covering roll become the circle of C font.Have after the certain clearance amount between the two edges with the relative plate body T of roller separator 5 maintenances then, make its actuating coil that passes through eddy-current heating portion, for example by load coil 6.
Induction coil 6 is being rolled into the plate body T heating that is the C font and producing the Joule heat of concentrating on two edges.Then, as shown in Figure 2, by between a pair of compression roller 8 time, the two edges T1, the T2 that have been heated are subjected to aspectant extruding and are welded into welding seam part M at plate body T.On the interior outside of the pipe P that is welded into by plate body T, form by welding seam part protrude by dissolve outside that material forms and in cap pass, they will be cut the device elimination.
Then, pipe P is forced to by cooling bath 12 after the cooling, by many outside dimensions that the size rolls 13 that forms a line arrived regulation by undergauge.Then through no illustrated shaping roller shaping pipe P on cutting machine 14, be cut into specific length, for example be cut into 4～6m and pile up on the finished product platform.
Below, be described in detail in the compression roller cell arrangement 20 with compression roller 8 in the butt seam welding steel tube manufacturing installation 1 with above schematic configuration, present embodiment with reference to Fig. 3 to Fig. 5.
As shown in Figures 1 and 2, in compression roller cell arrangement 20, plate body T with a pair of compression roller 8 clampings that the direct of travel of plate body T slightly becomes vertical direction to be arranged side by side.
Each compression roller 8 has vertical section shape as shown in Figure 3, and this compression roller 8 firmly is installed on the rotating shaft 22 that is located at its center of rotation, and rotating shaft 22 is supported on the not shown maintaining body rotationally by bearing.Compression roller 8 for example rotates with key and keyway setting-in with rotating shaft 22 with being integral.
Select the lining 24 of suitable specific thickness then, be loaded between the integrally formed top wide diameter portion 23 and compression roller 8 in the rotating shaft 22, can suitably set the height of compression roller 8 like this.This lining 24 of choosing dress when the height that makes a pair of compression roller 8 is consistent.In addition the nut 25 that is positioned on the compression roller is tightened, compression roller 8 is supported on the rotating shaft between lining 24 and the nut 25.
In addition, from the lower end of concave curved surface 28 to the downside, form outer surface and slightly be downside cylindraceous convex shoulder 29, and slightly be upper side flange portion 30 cylindraceous from concave curved surface 28 upper ends to the outer surface that forms specific thickness c the upside, this thickness c is set in for example 1～2mm scope, to guarantee sufficient mechanical.C if less than 1mm then this part the shortcoming of the little cracky of mechanical strength is arranged, if then probably have from welding slag collision upper side flange portion portion 30 that the welding seam part M of butt seam welding steel tube P disperses and fall to attaching to be solidificated on the pipe P greater than 2mm.
From the upper end of upper side flange portion portion 30 form to have medium pore 26 above the conical surface that slightly is frustum 31 that tilts of 27 top.With the center line of rotating shaft 22, the pivot of compression roller 8 is O, and the inclination angle that this conical surface 31 is formed preferably is set at suitable acute angle.
The lower end of concave curved surface 28 and the concave curved surface 28 of the cross section of downside convex shoulder 29 is to be bent to form the circular-arc bend 32 of radius R 1.
With the concave curved surface 28 opposite face places of compression roller 8, be provided with parallel imaginary line L with rotating shaft 22 center line O, the center of circle 01 of the radius R of concave curved surface 22 is arranged on this imaginary line L.Be made as a in the distance of handle, when the distance from imaginary line L to upper side flange portion portion 30 is made as b, the relation of a＜b arranged then from this imaginary line L to downside convex shoulder 29.It is shorter to the distance of rotating shaft 22 than downside convex shoulder 29 promptly to be set at upper side flange portion portion 30.
A pair of compression roller 8 with structure like this, be loaded on butt seam welding steel tube P production line state as shown in Figure 4.Compression roller 8 as shown in Figure 4 is the adjustment states before plate body T is advanced, and be abutted against mutually the downside convex shoulder 29 of each compression roller 8 among the figure, under this state, is provided with very little gap 33 between the upper side flange portion portion 30 between the upper end that comprises concave curved surface 28.The available not shown guiding mechanism in the interval of this a pair of compression roller 8 is done suitable adjustment, does suitable adjustment according to external diameter and the thickness of butt seam welding steel tube P.And be set at: even according to the pipe external diameter of P or the interval that thickness is suitably set a pair of compression roller 8, also will be in gap 33 the welding seam part M of the pipe P when concave curved surface 28 comes out to weld often.
According to present embodiment, compression roller 8 has said structure, in the position adjustment of carrying out compression roller 8 before the manufacturing of butt seam welding steel tube P in compression roller cell arrangement 20.At first,, as shown in Figure 4 the downside convex shoulder 29 of a pair of compression roller 8 is abutted against, under this state, adjusts the thickness of lining 24 so that make each concave curved surface 28 be positioned at sustained height making before plate body T advances.In addition, the abutment that makes downside convex shoulder 29 is alignd with the middle position of plate body T and adjust.
Then, compression roller 8 is opened greatly, make plate body T, and suitably set the distance between the compression roller 8 by between the concave curved surface 28.For example, as shown in Figure 5, downside 30 convex shoulders 29 are left a little and the center line of the radius R of concave curved surface 28 is set in same position between this concave curved surface.Under this state, the distance of upper side flange portion portion 30 is 2b.
Under this state, roll manufacturing to pressure pipe P.Promptly as shown in Figure 1 in the manufacturing installation 1 of butt seam welding steel tube P, for example the plate body T that is done by brass is pulled out continuously from uncoiler 2, by forming rolls 4 gradually floor-covering roll become the C font and lead to the load coil 6 of eddy-current heating portion.The two edges T1, the T2 that have been heated are docked welding with load coil 6 warmed-up plate body T between by a pair of compression roller 8 time.
When welding, as Fig. 2 and shown in Figure 5, the plate body T of C font is navigated between the slightly rounded a pair of concave curved surface 28 of a pair of compression roller 8,8, be subjected to concave curved surface 28 guiding, further be bent to littler radius of curvature from the C font, its two edges T1, T2 deviate from from the upper end of concave curved surface 28, and protrude from the gap 33 and butt joint mutually.Because the rigidity of plate body T deviates to be positioned at from concave curved surface 28 near two edges T1, the T2 in gap 33, bigger than the radius of curvature of the part that is positioned at concave curved surface 28, section slightly is the mountain type and protrudes out.
Therefore, plate body T is seen as approximate avette or tear drop shape from the vertical section, and two edges T1, the T2 of welding seam part M shown in Fig. 6 (a), can be following lower end ta of open state at thickness direction upper end tb and dissolve and be welded to each other, and is forced into upper end tb successively and welds.Particularly two edges T1, the T2 with actuating coil 6 heating is heated from the top, so tb one side in upper end dissolves because of heating-up temperature is high, if make its butt joint and be welded to upper end tb successively from the lower lower end ta of heating-up temperature, then the carrying out that dissolves because of heating integrally heated two edges T1, T2 reliably along thickness direction, do not have the danger that two edges T1, T2 separate.
And this moment, the radius of curvature that the butt seam welding steel tube P that has been shaped forms in the gap 33 of upper side flange portion portion 30 clampings is than being positioned at the bigger of concave curved surface 28, can not subside to the inside, therefore, it is avette that the vertical section of butt seam welding steel tube P slightly is, and the vertical maximum length y (longitudinal axis) that comprises welding seam part M is longer than horizontal maximum length (transverse axis) x.Therefore be convenient to shaping processing thereafter.
To this, shown in Fig. 6 (b), if the upper end tb of the two edges T1 of plate body T contacts at first, then the lower end ta that is blocked by upper end tb is difficult to be heated, so can not fully dissolve, weld insufficient, simultaneously, because upper end tb side too dissolves, separate easily and the not enough shortcoming of weld strength that two edges T1, T2 are separated from each other etc. arranged.In addition, as above-mentioned shown in Figure 7, two edges T1, the T2 of plate body T under the occasion of face contact, has the shortcoming that produces welding seam part M collapse-deformation at the same time, simultaneously, also has because of heat to be difficult to be transmitted to the low shortcoming of lower end ta weld strength.
And being inserted in C font plate body T between the compression roller 8 is squeezed and when adding thermal weld two edges T1, T2, can produce welding slag at weld part M.When particularly the material of plate body T is brass, have more welding slag s to disperse during than other material of employing, at this moment, as shown in Figure 5, the welding seam part M of two edges T1, T2 is protruding from the welding slag s that disperses under the state in the gap 33 between the convex shoulder 30,30.Particularly with from the lower end ta of the welding seam part M mode to upper end tb welding, most of outward direction of welding slag S disperses.Welding slag S along the conical surface 31 of compression roller 8 to around disperse, and, rebound so can suppress welding slag to collide upper side flange portion portion 30 and be stained with on the butt seam welding steel tube P because the thickness C of upper side flange portion portion 30 is limited at the scope of 1～2mm.
In addition, because with respect to 33 in gap, the gap of downside convex shoulder 29 is little, so can prevent the bottom collapse-deformation of butt seam welding steel tube P reliably.
For this reason, can produce the high-quality butt seam welding steel tube P that two edges T1, the T2 of plate body T are reliably welded.
According to above-mentioned present embodiment, after welding, both sides T1, the T2 of welding seam part M by compression roller 8 butt-welded tube P be difficult to take place to separate or welding seam part M bad phenomenon such as subside, carry out the welding of high manufacturing accuracy when fully guaranteeing weld strength, shaping processing thereafter is also easy.In addition, because both sides T1, the T2 of welding seam part M are soldered under the state during protruding from gap 33,, so suppressed to managing attaching on the butt seam welding P so welding slag is dispersed by around the guiding such as the conical surface 31, improve welding quality, can produce high-quality butt seam welding steel tube P.
Moreover, because with respect to the gap 33 of upper side flange portion portion 30, the gap of downside convex shoulder 29 is less, so the distortion of subsiding and causing to the gap of downside convex shoulder 29 during the bottom that can prevent to weld butt seam welding steel tube P.
The manufacturing installation of butt seam welding steel tube of the present invention, owing to set the rotating shaft from compression roller shortlyer to the distance of concave curved surface upper end than the distance of concave curved surface lower end, near the two edges of plate body, protrude laterally from the gap between two concave curved surfaces upper ends and two edges are welded to upper end side successively from its thickness direction lower end side, dissolve and weld so can be from the lower end, two edges heat reliably to the upper end, can make weld seam is not subsided, high-quality butt seam welding steel tube that weld strength is high.In addition, the welding slag that occurs in welding seam part is outwards dispersed reliably.The both sides of plate body protrude between concave curved surface upper end in the formed gap and the butt seam welding steel tube that is welded into, the longitudinal axis in its vertical section is longer than transverse axis, so soldered butt seam welding steel tube has formed the approximate avette or tear drop shape that the weld seam of two edges protrudes out from the gap, can in turn be heated to the upper end by the lower end from the thickness direction of two edges and dissolve, its weld strength is high also have been prevented to subside.In addition, upper end side at the concave curved surface of compression roller, because the upper side flange portion portion that decides thickness by rail has formed the taper seat to compression roller rotating shaft lopsidedness, so upper side flange portion portion is not fragile, and the intensity height of compression roller, and because its top has formed the conical surface, when welding slag dispersed from weld seam, welding slag scattered along the conical surface and leaves the surface of butt seam welding steel tube, can prevent that welding slag from attaching the butt seam welding steel tube surface.
In addition, the manufacture method of butt seam welding steel tube of the present invention, owing to be that the two edges of the plate body by compression roller are begun welding from the lower end of tabular body thickness direction, so can heat successively from the lower end of two edges to dissolve and be welded to the upper end, can produce weld seam and not subside, the high-quality butt seam welding steel tube that weld strength is high.Simultaneously the welding slag that is created in welding seam part is outwards dispersed reliably.In addition, butt seam welding steel tube, be near the two edges of plate body, look from vertical profile and to see laterally and to protrude and two edges are welded, look from vertical profile and to see that the longitudinal axis is longer than transverse axis, so the downside from its thickness direction during the welding two edges begins welding, can not cause that weld seam subsides and the weld strength deficiency, and make high-quality butt seam welding steel tube.
More than disclosed only be several specific embodiment of the present invention, but the present invention is not limited thereto, any those skilled in the art can think variation, all should drop in protection scope of the present invention.
Claims (6)
1. the manufacturing installation of a butt seam welding steel tube and manufacture method is characterized in that, the plate body of advancing is rolled into tubulose and makes it by between the concave curved surface that is formed at a pair of compression roller side, and its two edges are added thermal weld.
2. the manufacturing installation of a kind of butt seam welding steel tube as claimed in claim 1 and manufacture method, it is characterized in that, the two edges of plate body protrude from the gap that forms between the upper end of described concave curved surface and soldered butt seam welding steel tube, and the longitudinal axis in its vertical section is longer than transverse axis.
3. the manufacturing installation of a kind of butt seam welding steel tube as claimed in claim 1 and manufacture method is characterized in that, in the upper end side of the concave curved surface of described compression roller, the upper side flange portion portion by specific thickness forms the conical surface that the rotation shaft side to compression roller tilts.
4. the manufacturing installation of a kind of butt seam welding steel tube as claimed in claim 1 and manufacture method, the plate body of advancing is rolled into tubulose and makes it by between the concave curved surface that is formed at a pair of compression roller side, its two edges are added thermal weld, it is characterized in that, the two edges of the plate body that passes through described compression roller, weld to upper end side from the lower end side of tabular body thickness direction.
5. the manufacturing installation of a kind of butt seam welding steel tube as claimed in claim 4 and manufacture method, it is characterized in that, described butt seam welding steel tube be near the two edges of plate body part to be seen from the vertical section protrude laterally and with the two edges welding, and the longitudinal axis in vertical section is longer than transverse axis.
6. the manufacturing installation of a kind of butt seam welding steel tube as claimed in claim 1 and manufacture method is characterized in that, the distance from described compression roller rotating shaft to described concave curved surface upper end is set at shorter than the distance to described concave curved surface lower end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100537330A CN101927413A (en) | 2009-06-25 | 2009-06-25 | Manufacturing device and manufacturing method of butt seam-welded steel pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100537330A CN101927413A (en) | 2009-06-25 | 2009-06-25 | Manufacturing device and manufacturing method of butt seam-welded steel pipe |
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| CN101927413A true CN101927413A (en) | 2010-12-29 |
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| CN2009100537330A Pending CN101927413A (en) | 2009-06-25 | 2009-06-25 | Manufacturing device and manufacturing method of butt seam-welded steel pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111993076A (en) * | 2020-08-27 | 2020-11-27 | 吉林大学 | Be used for bionical tail pipe integration processing equipment of tractor |
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2009
- 2009-06-25 CN CN2009100537330A patent/CN101927413A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111993076A (en) * | 2020-08-27 | 2020-11-27 | 吉林大学 | Be used for bionical tail pipe integration processing equipment of tractor |
| CN111993076B (en) * | 2020-08-27 | 2021-11-23 | 吉林大学 | Be used for bionical tail pipe integration processing equipment of tractor |
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Application publication date: 20101229 |